Persistent luminescence dosimetric properties of UV-irradiated SrAl2O4:Eu2+, Dy3+ phosphor

Temperature dependence of persistent luminescence in β-irradiated SrAl2O4:Eu2+, Dy3+ phosphor

“…A significant consequence of this property implied that subsequent preheating followed by irradiation (preheating-irradiation cycle) at the same dose of the sample enhanced significantly the measured PLUM emission, creating a net effect of increasing the PLUM as a function of the number of successive preheating irradiation cycle. The present findings confirm similar PLUM-enhancing behavior first observed in UV-irradiated SrAl 2 O 4 :Eu 2+ , Dy 3+ phosphors [21].…”

“…The TL glow curve composed of multiple trapping states with different trap depths has been observed in many materials and in irradiated Eu 2+ -doped and rare-earth co-doped SrAl 2 O 4 :Eu 2+ . There is indubitable experimental evidence that the TL glow curve of MAl 2 O 4 :Eu 2+ , RE 3+ (M ¼ Ca, Sr, Ba) is composed of welldefined shallow and deep traps along with overlapping or continuously distributed traps [11,13,21,23]. In the present case, the low-temperature side of the TL glow curve intensity significantly decreases with time, confirming that the PLUM emission is mainly due the low-temperature TL peak with a very probable detrapping and retrapping processes from high-temperature traps.…”

Controlled electron and hole trapping inYPO4:Ce3+,Ln3+Krumpel1, Bos2, Bessière3 et al. 2009Phys. Rev. B644310View full textAdd to dashboardCite

“…Detailed experimental data that are able to verify these charge trapping models are still scarce and scattered over different investigations of different doping ions in different host lattices. [9][10][11][12] Here, we present a detailed and systematic experimental investigation into the nature of electron traps and into the relation between trap depth and the type of Ln ion in two closely related host-lattices YPO 4 and LuPO 4 . First, in Sec.…”

Thermally stimulated luminescence glow curve structure of β‐irradiated CaB4O7:Dy

“…The calculated frequency factors for some peaks are much smaller than expected, which is in accordance with the lattice vibration frequencies of 10 12 -10 14 /s. The lower results may be explained in terms of a localized transition in which recombination may occur without transition of the charge carriers into valance and/or conduction bands (25,26). All the calculated activation energies and frequency factors are given in Table 1, from which it can be seen that the distribution of the traps changes towards higher energy values when increasing the T m of the glow peaks; this is a consequence of the emptying the shallower traps.…”